Hey, sorry it's not working for you! The Epic version should work, and that error message is strange because it uses Unity not Unreal.
Can you tell me what operating system you're using? Did you find the "A Short Hike" data folder at this path:
C:\Program Files\Epic Games\AShortHike\AShortHike_Data
The patch is supposed to overwrite certain files, but preserve the existing files from the Epic installation.